Beta version of the standardised referral software in the "one-stop" trial. The software is integrated in the GP's electronic patient health records. The referral forms consist of 3 parts: Information needed for anaesthesia (left side of screen), information needed for surgeons (left side of screen) and additional information provided by the GP (right side of screen). When the GP enters an ICPC code (in this example D98 Cholelithiasis) the left side of the screen appears automatically. Booking of surgery is also done from this screen. This referral is fully integrated in the electronic health record (Profdoc Winmed).